Dark eldar conduct raids in Hadron Expanse

During 03-04.021M42, the strategic focus of the Imperium and Chaos remained fixed on the Perseus Deeps, while the Hadron Expanse became a backwater theatre. Both sides still invested resources in the region, but the relative lack of forces in the galactic east meant it was easier for the smaller factions vying for power in the Aleph Sector. The dark eldar, still led by Vlokarion, were in an uneasy alliance with the Ynnari faction, who were still attempting to uncover and acquire necron technology in their war against the chaos God Slaanesh, began a series of raids against imperial assets.

The Imperium had lost their main bases in the Hadron expanse, save for the systems of Oreen and Vanir, and it was Vanir that came under attack. With only a small garrison of Valdograd guard, the fast moving Dark Eldar were able to surround the imperial force after raiding an outlying settlement. The regiment was all but destroyed, allowing the Dark Eldar to secure a number of slaves, though not much in the way of useful necron intelligence. While the Ynnari wondered whether the Dark Eldar were even working towards their common goal, the warriors of Vlokarion continued to pillage the now helpless imperial outpost until a force of Grey Knights came to their aid.

The elite astartes force was able to track down the Drukhari main force, defeating it in open battle before the remnants of the Dark Eldar disappeared back into the webway. Vlokarion's troops had got greedy, but the need to protect the imperial settlements of Vanir and Oreen with more forces had further consequences.